Network system that facilitates device recognition in a high-frequency communication environment

Abstract

System recognition is performed on devices connected to an identical system without recognizing a device of a different system as a device of the identical system in high-frequency communication. In a device network system, in a state in which a first device group is set in advance as a physically connectable system or in a state in which the first device group is recognized as a physically connectable system, in a case where the first device group or a second device detects occurrence of a state in which the second device outside the system is recognized as belonging to the system, the first device group or the second device causes the second device to leave the system. As a result, a network can be normally maintained even in high-frequency communication.

The invention claimed is: 
     
       1. A device network system comprising:
 a first network including a first device group and a first line group, the first device group including a plurality of devices, the first line group being connected to the plurality of devices; and 
 a second network including a second device and a second line connected to the second device, the second device being physically separated from the first network, wherein 
 in a state in which the first device group is set in advance as a physically connectable group or in a state in which the first device group is recognized as a physically connectable group, in a case where the first device group detects occurrence of a state in which the second device is recognized as belonging to the physically connectable group associated with the first device group due to a presence of crosstalk that occurs between the first network and second network, the first device group or the second device performs an action under an assumption that the second device does not belong to the physically connectable group, 
 in the first device group, a main device selected from among the plurality of devices determines, using low-frequency communication, whether the plurality of devices except for the main device belong to the physically connectable group. 
 
     
     
       2. The device network system according to  claim 1 , wherein
 in the first device group, the main device selected from among the plurality of devices determines whether the state in which the second device is recognized as belonging to the physically connectable group has occurred. 
 
     
     
       3. The device network system according to  claim 2 , wherein
 the action performed by the first device group or the second device under the assumption that the second device does not belong to the physically connectable group includes an action of denying belonging of the second device to the physically connectable group. 
 
     
     
       4. The device network system according to  claim 1 , wherein
 the action performed by the first device group or the second device under the assumption that the second device does not belong to the physically connectable group includes an action of denying belonging of the second device to the physically connectable group. 
 
     
     
       5. The device network system according to  claim 4 , wherein
 in the first device group, the main device selected from among the plurality of devices denies belonging of the second device to the physically connectable group.